kdc/hpropd.c

   1 /*
   2  * Copyright (c) 1997-2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "hprop.h"
  35
  36 RCSID("$Id$");
  37
  38 static int inetd_flag = -1;
  39 static int help_flag;
  40 static int version_flag;
  41 static int print_dump;
  42 static const char *database;
  43 static int from_stdin;
  44 static char *local_realm;
  45 static char *ktname = NULL;
  46
  47 struct getargs args[] = {
  48     { "database", 'd', arg_string, &database, "database", "file" },
  49     { "stdin",    'n', arg_flag, &from_stdin, "read from stdin" },
  50     { "print",      0, arg_flag, &print_dump, "print dump to stdout" },
  51 #ifdef SUPPORT_INETD
  52     { "inetd",     'i', arg_negative_flag,      &inetd_flag,
  53       "Not started from inetd" },
  54 #endif
  55     { "keytab",   'k',  arg_string, &ktname,    "keytab to use for authentication", "keytab" },
  56     { "realm",   'r',   arg_string, &local_realm, "realm to use" },
  57     { "version",    0, arg_flag, &version_flag, NULL, NULL },
  58     { "help",    'h',  arg_flag, &help_flag, NULL, NULL}
  59 };
  60
  61 static int num_args = sizeof(args) / sizeof(args[0]);
  62
  63 static void
  64 usage(int ret)
  65 {
  66     arg_printusage (args, num_args, NULL, "");
  67     exit (ret);
  68 }
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73     krb5_error_code ret;
  74     krb5_context context;
  75     krb5_auth_context ac = NULL;
  76     krb5_principal c1, c2;
  77     krb5_authenticator authent;
  78     krb5_keytab keytab;
  79     krb5_socket_t sock = rk_INVALID_SOCKET;
  80     HDB *db = NULL;
  81     int optidx = 0;
  82     char *tmp_db;
  83     krb5_log_facility *fac;
  84     int nprincs;
  85
  86     setprogname(argv[0]);
  87
  88     ret = krb5_init_context(&context);
  89     if(ret)
  90         exit(1);
  91
  92     ret = krb5_openlog(context, "hpropd", &fac);
  93     if(ret)
  94         errx(1, "krb5_openlog");
  95     krb5_set_warn_dest(context, fac);
  96
  97     if(getarg(args, num_args, argc, argv, &optidx))
  98         usage(1);
  99
 100     if(local_realm != NULL)
 101         krb5_set_default_realm(context, local_realm);
 102
 103     if(help_flag)
 104         usage(0);
 105     if(version_flag) {
 106         print_version(NULL);
 107         exit(0);
 108     }
 109
 110     argc -= optidx;
 111     argv += optidx;
 112
 113     if (argc != 0)
 114         usage(1);
 115
 116     if (database == NULL)
 117         database = hdb_default_db(context);
 118
 119     if(from_stdin) {
 120         sock = STDIN_FILENO;
 121     } else {
 122         struct sockaddr_storage ss;
 123         struct sockaddr *sa = (struct sockaddr *)&ss;
 124         socklen_t sin_len = sizeof(ss);
 125         char addr_name[256];
 126         krb5_ticket *ticket;
 127         char *server;
 128
 129         sock = STDIN_FILENO;
 130 #ifdef SUPPORT_INETD
 131         if (inetd_flag == -1) {
 132             if (getpeername (sock, sa, &sin_len) < 0) {
 133                 inetd_flag = 0;
 134             } else {
 135                 inetd_flag = 1;
 136             }
 137         }
 138 #else
 139         inetd_flag = 0;
 140 #endif
 141         if (!inetd_flag) {
 142             mini_inetd (krb5_getportbyname (context, "hprop", "tcp",
 143                                             HPROP_PORT), &sock);
 144         }
 145         sin_len = sizeof(ss);
 146         if(getpeername(sock, sa, &sin_len) < 0)
 147             krb5_err(context, 1, errno, "getpeername");
 148
 149         if (inet_ntop(sa->sa_family,
 150                       socket_get_address (sa),
 151                       addr_name,
 152                       sizeof(addr_name)) == NULL)
 153             strlcpy (addr_name, "unknown address",
 154                      sizeof(addr_name));
 155
 156         krb5_log(context, fac, 0, "Connection from %s", addr_name);
 157
 158         ret = krb5_kt_register(context, &hdb_kt_ops);
 159         if(ret)
 160             krb5_err(context, 1, ret, "krb5_kt_register");
 161
 162         if (ktname != NULL) {
 163             ret = krb5_kt_resolve(context, ktname, &keytab);
 164             if (ret)
 165                 krb5_err (context, 1, ret, "krb5_kt_resolve %s", ktname);
 166         } else {
 167             ret = krb5_kt_default (context, &keytab);
 168             if (ret)
 169                 krb5_err (context, 1, ret, "krb5_kt_default");
 170         }
 171
 172         ret = krb5_recvauth(context, &ac, &sock, HPROP_VERSION, NULL,
 173                             0, keytab, &ticket);
 174         if(ret)
 175             krb5_err(context, 1, ret, "krb5_recvauth");
 176
 177         ret = krb5_unparse_name(context, ticket->server, &server);
 178         if (ret)
 179             krb5_err(context, 1, ret, "krb5_unparse_name");
 180         if (strncmp(server, "hprop/", 5) != 0)
 181             krb5_errx(context, 1, "ticket not for hprop (%s)", server);
 182
 183         free(server);
 184         krb5_free_ticket (context, ticket);
 185
 186         ret = krb5_auth_con_getauthenticator(context, ac, &authent);
 187         if(ret)
 188             krb5_err(context, 1, ret, "krb5_auth_con_getauthenticator");
 189
 190         ret = krb5_make_principal(context, &c1, NULL, "kadmin", "hprop", NULL);
 191         if(ret)
 192             krb5_err(context, 1, ret, "krb5_make_principal");
 193         _krb5_principalname2krb5_principal(context, &c2,
 194                                            authent->cname, authent->crealm);
 195         if(!krb5_principal_compare(context, c1, c2)) {
 196             char *s;
 197             ret = krb5_unparse_name(context, c2, &s);
 198             if (ret)
 199                 s = "unparseable name";
 200             krb5_errx(context, 1, "Unauthorized connection from %s", s);
 201         }
 202         krb5_free_principal(context, c1);
 203         krb5_free_principal(context, c2);
 204
 205         ret = krb5_kt_close(context, keytab);
 206         if(ret)
 207             krb5_err(context, 1, ret, "krb5_kt_close");
 208     }
 209
 210     if(!print_dump) {
 211         asprintf(&tmp_db, "%s~", database);
 212
 213         ret = hdb_create(context, &db, tmp_db);
 214         if(ret)
 215             krb5_err(context, 1, ret, "hdb_create(%s)", tmp_db);
 216         ret = db->hdb_open(context, db, O_RDWR | O_CREAT | O_TRUNC, 0600);
 217         if(ret)
 218             krb5_err(context, 1, ret, "hdb_open(%s)", tmp_db);
 219     }
 220
 221     nprincs = 0;
 222     while(1){
 223         krb5_data data;
 224         hdb_entry_ex entry;
 225
 226         if(from_stdin) {
 227             ret = krb5_read_message(context, &sock, &data);
 228             if(ret != 0 && ret != HEIM_ERR_EOF)
 229                 krb5_err(context, 1, ret, "krb5_read_message");
 230         } else {
 231             ret = krb5_read_priv_message(context, ac, &sock, &data);
 232             if(ret)
 233                 krb5_err(context, 1, ret, "krb5_read_priv_message");
 234         }
 235
 236         if(ret == HEIM_ERR_EOF || data.length == 0) {
 237             if(!from_stdin) {
 238                 data.data = NULL;
 239                 data.length = 0;
 240                 krb5_write_priv_message(context, ac, &sock, &data);
 241             }
 242             if(!print_dump) {
 243                 ret = db->hdb_close(context, db);
 244                 if(ret)
 245                     krb5_err(context, 1, ret, "db_close");
 246                 ret = db->hdb_rename(context, db, database);
 247                 if(ret)
 248                     krb5_err(context, 1, ret, "db_rename");
 249             }
 250             break;
 251         }
 252         memset(&entry, 0, sizeof(entry));
 253         ret = hdb_value2entry(context, &data, &entry.entry);
 254         krb5_data_free(&data);
 255         if(ret)
 256             krb5_err(context, 1, ret, "hdb_value2entry");
 257         if(print_dump)
 258             hdb_print_entry(context, db, &entry, stdout);
 259         else {
 260             ret = db->hdb_store(context, db, 0, &entry);
 261             if(ret == HDB_ERR_EXISTS) {
 262                 char *s;
 263                 ret = krb5_unparse_name(context, entry.entry.principal, &s);
 264                 if (ret)
 265                     s = strdup("unparseable name");
 266                 krb5_warnx(context, "Entry exists: %s", s);
 267                 free(s);
 268             } else if(ret)
 269                 krb5_err(context, 1, ret, "db_store");
 270             else
 271                 nprincs++;
 272         }
 273         hdb_free_entry(context, &entry);
 274     }
 275     if (!print_dump)
 276         krb5_log(context, fac, 0, "Received %d principals", nprincs);
 277
 278     if (inetd_flag == 0)
 279         rk_closesocket(sock);
 280
 281     exit(0);
 282 }